rock tumbler for cone 5 pot sherds

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I've been saving my cone 5 pottery seconds with the thought of smashing them into pieces to put into a rock tumbler. Before I jump on a used Lortone 3A (holds 3 pounds) rock tumbler, I'd like to hear success and failure stories.

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I use a rock tumbler often to smooth shards of old pots, fired grog and the rocks I make and fire to Cone 8. I just use the cheap children's type tumbler you buy in a hobby shop. On my second one and doing fine.

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This is something I've thought of doing, and wish I'd saved the old family rock tumbler when my mother died. Can you tell me what hobby shop, or where else, one might buy one of these and how much they run? I think Harbor Freight has them, for one.... But a child's one might be cheaper and might be an option.

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I had also thought of doing it with ^6 red clay pieces fired to maturity but with no glaze. I was thinking it would be a nice way to fill a tabletop fountain, were I ever to make one. Some glazed shards mixed in with the the unglazed would be nice, too. Or making small, rounded "pebbles" out of clay, firing them, and then tumbling them to see if they'd take on a sheen.